[DeTomaso] Fw: Poor Brakes

[Will Demelo]

I'm missing something. I get boosted brakes at random times. 1 out of 15 attempts at speed will give me good brakes. If the diaphram was cracked or rotted, it would never work. 
Where is the check valve? My flex line going to the booster has been replaced within the last 10 years and goes into a banjo fitting.
I have a dual CNC master btw.
  ----- Original Message ----- 
  From: JDeRyke at aol.com 
  To: wdemelo at cogeco.ca ; detomaso at realbig.com 
  Sent: Tuesday, July 14, 2009 1:30 AM
  Subject: Re: [DeTomaso] Fw:  Poor Brakes



  In a message dated 7/13/09 7:05:52 PM, wdemelo at cogeco.ca writes:


    I disconnected the booster vacuum hose under the car. I then attached a vacuum and gauge to the hose to the booster and it won't hold a vacuum at all.  Booster is toast, correct?


  Maybe. There are 3 things that sometimes go south: the big rubber diaphragm inside the can (rot or cracks), the plastic connector/check valve on the booster bottom (varnish and crud but it can be cleaned) and the hose going up to the booster from the under-floor hard line. I also found one wide-body Pantera that had an under-floor hard line cracked in the middle. Try your vacuum test directly into the check valve with a known-good vacuum hose, bypassing both factory hoses and the hard line. A surprising number of Panteras are driving around with that front hose rotted or cracked. Stock brakes are good enough at around-town speeds that they hadn't noticed.... Good luck- J Deryke


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